16．All the electric equipment ______ will be fixed in the office ______ great importance to us．（　�。�
A．that； are ofB．what； is ofC．that； is ofD．what； are of

分析 所有在辦公室里安裝的電氣設(shè)備對我們都很重要．

解答 C 考查定語從句．本句被修飾的先行詞是equipment，在從句中做主語用that來引導(dǎo)；又因為equipment做設(shè)備講是不可數(shù)名詞，所以謂語動詞用is．故答案選C．

點評 定語從句又稱為形容詞性從句，綜觀歷年高考試題，我們可以發(fā)現(xiàn)該語法項目是測試中的熱點與難點，解定語從句的題目首先要知道哪一句是主句，哪一句是從句，被修飾的詞是誰，從句中的句子成分缺失什么，根據(jù)缺失成分的不同從而選出相對應(yīng)的關(guān)系代詞或者關(guān)系副詞，從而選出正確的答案，解題的關(guān)鍵是從句句子的成分分析．

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